Billet Specialties Tru Trac Serpentine System - LS (Top Mount) - Manual (Page 4)

www.billetspecialties.com • Tech Line 708.588.0505 6 LSx Top Mount Tru Trac - 13455 / 13475 7
Engine Prep
• Disconnect battery
• Remove existing accessory drive and water pump
• Remove factory crank pulley bolt with an impact wrench and 24mm socket
• Save the existing crank bolt, you will need it later
• Remove crank pulley/damper with the recommended tools:
• J-41816
Crankshaft balancer remover or similar
• J-42386-A Flywheel holding tool
• J-41816-2 Crankshaft balancer remover step plate
• Clean gasket areas, inspect front crank seal and replace if necessary
GM P/N 12585673
• Leave flywheel holding tool in position for damper installation
Install Crank Damper
Source: GM document #642784
Recommended Installation Tools:
• J-41665 Crankshaft balancer and sprocket installer
• J-41478 Crankshaft front oil seal installer - Use threaded rod and nut only
• J-42386-A Flywheel holding tool
• J-45059 Angle meter
• Inspect crank snout for burrs or scratches - clean up with fine emery cloth or steel wool.
• Slide the new damper on crank snout as far as possible.
• Use the J-41665 and the threaded rod and nut from J-41478 in order to install the balancer.
• Assemble the threaded rod, nut, washer and installer. Insert the smaller end of the installer
into the front of the balancer.
• Using a wrench hold the hex end of the threaded rod. Use a second wrench and rotate
the installation tool nut clockwise until the balancer is started onto the crankshaft.
• Remove the tool and reverse the tools direction. Position the larger end of the installer
against the front of the balancer.
• Using a wrench hold the hex end of the threaded rod. Use a second wrench and rotate
the installation tool nut clockwise until the balancer is installed onto the crankshaft.
• Remove the balancer installation tool.
• Install the old balancer bolt and tighten. Tighten old balancer bolt to 240 ft.lbs. (330N·M)
IMPORTANT: Failure to apply proper torque to the old balancer bolt may result in the
balancer not being fully seated. This could lead to failure of this joint in the future.
IMPORTANT: The nose of the crankshaft should be recessed 2.4 - 4.48 mm (0.094 - 0.176 in)
into the balancer bore. Remove the old bolt and measure the hub to crankshaft distance.
Installing New Crankshaft Bolt
• Coat the three to five threads of the new bolt with LocTite 272 thread locker.
Notice: Be sure to follow the torque procedure for installing the new crankshaft bolt. Use of
impact tools, or not using torque and angle method will result in joint failure.
• Install and tighten the new crankshaft bolt a first pass to 37 ft.lbs. (50N·M)
• Put a paint stripe on the bolt running from the 12 o'clock to the 6 o'clock position in order to
verify the correct torque requested in the next step.
IMPORTANT: When tightening for the second pass, a minimum torque of 236 ft.lbs. (320 N·M)
should be observed. If this torque is not achieved, the bolt (GM part #12557840) should be
replaced.
• Tighten the crankshaft balancer bolt a second pass to 140 degrees using the J-45059.
IMPORTANT: Recheck the position of the previously painted stripe to assure 140 degree
rotation. Achieving the correct torque angle is critical to the success of this repair.
Over-torquing or under-torquing the joint will result in an unsatisfactory installation.
• Remove the J-42386-A Flywheel Holding Tool.